Need advice on new unit??

Just purchased an 06 ram 1500 used, came with in dash nav pioneer unit Avic-d3, when the truck was purchased buy previous owner from dodge dealer it came with a package deal that included one year subscription of sirius radio service, which means the hardware for sirius had to have been installed right?? Ok, On my bmw which is no longer running I had a complete sirius system installed, but since that vehicle no longer works, and after learning the dodge has a unit already installed, I called to do a subscription transfer, old to new, but sirius says they cannot connect the signal for some odd reason. I am familiar with the hardware on the sirius unit, so I checked under the steering wheel in the dodge to see if I could physically find the sat unit, but did not see it, as well as the antenna cord that mounts on the roof. Unless if the unit was some how installed in the dash with the head unit somehow, Im starting to believe it may have been taken out of the dodge why?? ( no idea ) So im looking for good suggestion on what to do to get service or support???

Maybe the truck came with stock head unit and Sirius but then the previous owner upgraded to the Avic-d3 head unit without hooking up Sirius or the existing setup was not compatible with the new Avic-d3 and the previous owner stripped it.

If you do not see an antenna on the roof... chances are there is no longer a unit in the vehicle.

The manufacture tag had the list of features and optional things. The sirius subscription was in the plan. My second question is would I be able rather than purchasing a whole new sirius unit but to take and install my old unit to the new vehicle, I do understand that my old unit was connected to a Kenwood head unit, the new unit is a pioneer, wouldn't I have to get a pioneer unit adapter???